She has now reportedly been found dead in a bail hostel in Madstone, Kent, after being released from jail where she served just half her six-year sentence.

Lynn Wheeldon, mum of Fenton's dad Michael, told Sun Online: "We heard on Friday Kelly had been found dead in the hostel.

"I heard it may have been an overdose but police haven't done a post mortem yet so we're not sure.

"We're feeling a bit weird about the whole thing but relieved because she killed my grandson so I'm not going to shed a tear."

Little Fenton died in 2015 after being fed the substance

Explaining how he heard the news of his son's death while still in prison himself, Mr Hogan added: 'She ruined my life. He was my first child and he died when I was in prison so it makes me feel better that she had a hard time inside.'

A former fellow inmate of Emery's at Oakham who did not wish to be named said: 'She came in to Oakham with another child killer. Two of them at the same time.

'She didn't have any friends, unsurprisingly. 'She made up this story that the kid managed to get into a bucket and drank it himself. It was just rubbish. 'I'm not sad. I'm glad. She's gone to hell.'

In 2015, she was found guilty of killing toddler son by feeding him methadone to 'knock him out'.

Blood samples taken from the child showed he had as much of the drug on his system as an adult on methadone maintenance therapy.

And hair samples showed that, in the months before his death, he had ingested the drug on at least two other occasions.